<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script>
</head>
<body>
    
    <script>
         var baseUrl = "https://api.douban.com/v2/movie/"
         async function http({url}){
            return $.ajax({
                url:baseUrl+url,
                dataType:"jsonp"
            })
        }
        async function getData(){
            var data = await http({url:'top250'})
            var id = data.subjects[0].id;
            var movieData = await http({url:id});
            console.log(movieData)       
        }
        getData()
    </script>
</body>
</html>